itro, and phenyl, and R3 and R4 together form an epoxy groupand Q is ##STR68## and n is 0 and p is 0 and r is 1 or n is 1 and p is 1 and r is 1 or Q is a bond between O and Q and n is 0 and p is 0 and r is 1 or n is 1 and p is 0 and r is 1, or Q is ##STR69## and n is 0 and p is 0 and r is 1, or Q is ##STR70## and p is 1 and n is 1 and r is 0 and t is 1 or p is 0 and n is 1 and r is 0and t is 0